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[6.12.6] Wrong free space capacity reported for SSD pool/cache drives

By suchamoneypit

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  • Annoyance

I have 3, 3TB SSDs in a pool for my cache. The Size correctly reports 3TB, but the "Used" and "Unused" incorrectly total to around 2.15TB.

 

image.thumb.png.6f3e0991d0702a4a91ccd4288d3fc870.png

 

Notably, when doing a large amounts of downloads, the other day the Used space got up to 2.8TB+ of Used space. This seems to confirm the reported free space is being incorrectly calculated or displayed. The True capacity of 3TB seems correct, but the Free space utility never lists it. It should be showing 2.7-2.8TB of free space right now but only lists 2.04. Diagnostics ZIP is attached. My Unraid has done a couple upgrades and this issue has been around since I installed these 3 drives to the pool. 

 

 

diagnostics.zip

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    Grand Master

    JorgeB

    Moderators

    This is an old btrfs issue when an odd number of devices are used for a raid1 pool, free space will get close to correct as you fill up the pool, used space will always be correct.

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